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Thanks for all the replies and well, if it's not waterproof its ok I just want it weatherproof. Anyways I'm going to use it for a firefighting robot (and you know when the alarm goes off there's water sprinklers that go off as well in most buildings, so I want the robot to be able to survive occasional water splashes and sprinkles). With that in mind, is it possible to switch the transducers on the PING sensor wkithout having to dramatically change the electronic scheme of the sensor?